/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.tangjiabao.halodb.dbutils.handlers;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;

import org.apache.commons.dbutils.ResultSetHandler;

import cn.tangjiabao.halodb.core.map.HaloGetMap;
import cn.tangjiabao.halodb.utils.orm.HOrmUtil;

/**
 * <code>ResultSetHandler</code> implementation that converts the first
 * <code>ResultSet</code> row into a <code>Map</code>. This class is thread
 * safe.
 *
 * @see org.apache.commons.dbutils.ResultSetHandler
 */
public class HaloGetMapHandler implements ResultSetHandler<HaloGetMap> {

  



    /**
     * Converts the first row in the <code>ResultSet</code> into a
     * <code>Map</code>.
     * @param rs <code>ResultSet</code> to process.
     * @return A <code>Map</code> with the values from the first row or
     * <code>null</code> if there are no rows in the <code>ResultSet</code>.
     *
     * @throws SQLException if a database access error occurs
     *
     * @see org.apache.commons.dbutils.ResultSetHandler#handle(java.sql.ResultSet)
     */
    @Override
    public HaloGetMap handle(ResultSet rs) throws SQLException {
        return rs.next() ? this.toMap(rs) : null;
    }
  
    private HaloGetMap toMap(ResultSet rs) throws SQLException {
    	HaloGetMap result = new HaloGetMap();
        ResultSetMetaData rsmd = rs.getMetaData();
        int cols = rsmd.getColumnCount();
        for (int i = 1; i <= cols; i++) {
            String columnName = rsmd.getColumnLabel(i);
            if (null == columnName || 0 == columnName.length()) {
              columnName = rsmd.getColumnName(i);
            }
            columnName=HOrmUtil.toFiled(columnName);
            result.put(columnName, rs.getObject(i));
        }
        return result;
    }
}
